Heat indicator



Jwvmtou eurellaz dlien i A. R. LEWELLEN HEAT INDICATOR Filed July 10. 1930 n I; w 7294 9413224 "wail/72 m Aug. 16, 1932.

Patented Aug. 16, 1932 UNITED STATES P TENT orrieE ALBERT R. LEWELLEN, 015 DETROIT, MICHIGAN, ASSIGNOR 'IO" GENERAL MOTORS 00R- PORATION, OF DETROIT,

MICHIGAN, A CORPORATION OF DELAWARE HEAT INDICATOR Application filed July 10,

tors applied to the internal combustion engine of an automotive vehicle.

The particular novelty of the invention resides in a bracket which is attached to the gage at the instrument board and which forms a part of the gage per se.

The bracket of the invention is composed of two stamped halves which fit together or mate and are sweated to securely unite them to form the bracket. In stamping the two alves, provision is made for a chamber adapted to receive the fluid of the lndlactor. Provision is also made for a channel portion in which there is received the glass column for indicating a change in the height of the indicating fluid. The chamber and channel portion of the bracket are united by means of a metallic U-tube which transmits the liquid from the chamber to the glass column. The glass column is held in place by means of a plurality of fabric packings positioned within the channel and held in place by means of a backing plate to which the bracket is attached. The chamber of the bracket is closed at its top by means of a plug soldered or sweated into placeinto which there is screwed a machine screw. A suitable opening at the the chamber receives the tu WlllCll communicates with a bulbin the engine block.

On the drawing: Figure 1 shows a view of so muchpf'an automotive vehicle and its engine asis'iiecessary to illustrate the application of the in-- in section.

Figure 2 is a front view of the gage.

Figure 3 is a rear view of the structure of Figure2.

Figure 4 is a section on the line Figure 2.

) threaded o enin in the lu vention, parts being broken away and shown' p g p m which extends, into a Figure 5 is a section on the line"-55 of I i nidtight relay 1930. semi 467,040.

to th e bulb is the metallic vided with an armor and strument board 6; where it gage 20, The installation describedis conventional. r v I I The particular novelty of thepre'sent invention resides in.the gage 20. The ga'ge has the front plate 22 provided with an'opening 24at its center formed by inwardly pressing portions 26 of the metal of the facing plate. Over the plate 26 there is applied the usual glass 28 held in place by means of a bezel 30. A backing plate '32 having a central opening 34 conforming to theopening 24 in the facing plate 22 extends over the back of the facing plate and has secured thereto by means of the tongues 36, the bracket of the invention indicated as a whole ,at138. The bracket comprises the two stamped halves 40' and 42 extends to the inis connected to the of theparts so far WhICh are sweated together in their final form shown in Figures 3 and5.

'n forming'each bracket half 40 or 42, s formed therein the hemi-cylindrical portion44, which portions mate in final-as sembly to form the chamber 46. The chamber has three openings, one at its side indicated at 48 to receive the pipe 18 from the bulb 16; a second or filling opening-50 at its top which is closed by pipe 18' which is likewise filled with air and is preferablyprosweated or soldered therein,fwhich in turn has the machine screw and a third opening56 at the bottom of the chamber 46, the purpose of which is to receive one arm of a metallic U-tube 58, the other arm 60- of channel portion 62 twfo edges of the bracket 38 which is to receive the formed. betwe and the: pur' inn 64. ds into and is secured in liqv n in the lower end 66 of the glass tube 643" e tube is held in place by means of the fab ejwashers 68 positioned at the top and bottoih of the tube and tightly mounted in the channel 62 and held therein by the backing plate .32. The tube 64 has a The end 60 of the small opening 70 to the atmosphere at its upper portion. The tube 64 isso ositione'd that it is immediately in the rear of the opening 24.

The facing plate 22 is provided with any suitable designations such as hot, normal and cold, shown in Figure 2 to indicate temperature. The air in the bulb 16 and tube 18 will ex and with an increase in temperature and t e pressure in the bulb and pipe 18 will force the fluid 72 to rise in the glass tube 64.

I claim: 1. In a temperature indicator, a bracket comprising a plurality of stamped mating members secured together in fluid tight relation said members having a chamber for receiving a liquid and a channel formed therein, a glass column mounted in said channel, Y20 and means connecting said chamber and column to permit the flow of liquid therebe- J tween. 2. In a temperature indicator, a bracket comprising two stampings mating with and secured to each other in liquid tight relation and forming a liquid receiving chamber and a channel therebetween, a glass tube open at both ends mounted in said channel, and a U-tube connecting said chamber and glass 80 column to permit the flow of liquid therebetween. a

3. In a temperature indicator, a plurality of stampings secured together in fluid tight relation to form a bracket, a plate to which 85 said bracket'is secured, said bracket having a chamber for receiving an indicating fluid and a channel formed therein, transparent means in said. bracket to show changes in level of said liquid, resilient means between 40 said plate and channel for mounting said transparent means, and means connecting said chamber and transparent means to permit the flow of fluid therebetween.

In testimony whereof I aifix my signature. as ALBERT R. LEWELLEN. 

